Casing-clamp.



No. 675,U47. Patented May 28, I901. W. H. MAcGARVEY & G. TANNEB.

CASING CLAMP.

(Application filed Feb. 26, 1901.)-

(No Model.)

FIGJ- WITNESSL S.

Y: "cams vzvsns cu. momallma, wnsmucnon. n. c.

FFICE.

\VILLIAIWI HENRY MAOGARVEY, OF GLINIK MARYAMPOLSKI, AND GEORGE TANNER, OF STRYJ, AUSTRIAJIUNGARY.

CASlNG-CLAM P.

SPECIFICATION forming part of Letters Patent No. 675,047, dated May 28, 1901.

Application filed February 26, 1901- Serial No. 48,878. (No model.)

T 60% whom, it may concern.-

Be it known that we, \VILLIAM HENRY lVIACGARVEY, of Glinik Maryampolski, and GEORGE TANNER, of Stryj, Province of Gallicia, Empire of Austria-Hungary, have invent-- ed certain new and useful Improvements in Casing-Clamps, of which the following is a specification.

This invention relates to an improved cas- IO ing-clamp, and has for its object to present a simple and very efficient appliance for sustaining in a reliable manner the tubular casing of a bore-hole during the time of the hole being bored and cleaned. Until now there have been used simple clamps, which some times fail and let the casing escape, so that the latter sinks down, and thus hinders the work.

The improved casing-clamp of this present invention consists of two clamping-jaws so arranged that if the casing held between the two jaws tends to sink down these jaws close tightly and automatically around the casing and prevent sinking down of the latter. The

two jaws when in open position?.'. 6., during pulling forth of the casingsare retained by means of a bolt which can easily be inserted between and withdrawn from the jaws, so that the casing may always be in a secure manner 0 released and sustained, as the case may be.

Figures 1 and 2 of the annexed drawings representin a side View and in plan the improved casing-clam p.

As is obvious, the clamp consists of the two 5 clamping-jaws a, provided, if required, on their inner surfaces with a lining b and each carrying at top and at bottom two bolts or cross'bars c, to which are hinged the inner ends of supporting-arms d (l, the opposite 4o ends of which turn on cross-bolts e, forming a frame 7; with the longitudinal walls f. This frame is placed above the top opening of the borehole and surrounds the same. The supporting-armstl extend obliquely upward from 5 the bolts 0 toward the clamping-jaws in such a manner that the two jaws are movable up and down and parallel one to the other and tend constantly to sink down and to approach each the other, and thereby maintain in a reliable manner the casing between them. In caseit is desired to lower the latter the two clam ping-jaws must be opened or raised and retained in their lifted position. For this purpose we arrange a treadle g on one side of the frame It. One end of this treadle carries a bolt h, projecting through a slot j of the frame It, and is raised with the one end of the treadle 9 when the latter is moved down and enters between the two clamping-jaws and beneath the lower set of the supporting-arms d, and thus prevents closing of the jaws as long as the treadle g is being kept down. In case, however, the treadle is relieveclthat is to say, in case the casing is to be sustainedthe bolt h falls back, thus freeing the clamp ing-jaws,which then fall down, too, and clamp the casing. The downward movement of the bolt h is hereby assisted by a spring 91, fixed with one of its ends to the frame and with its other to the treadle.

We claim as our invention 1. In a casing-clamp: in combination: two clamping-jaws a, a supporting-frame 71", having a slotj in its side wall, arms (I d hinged to the clamping-jaws and to the su pporting- 75 frame, a vertically-moving bolt h projecting through the slot and means for forcing it upward between the clamping-jaws and under the arms 61 dfor retaining the clampingjaws in their opened position substantially as described.

2. In a casing-clamp the combination of two clamping-jaws a, of a supporting-frame in, arms d cl, hinged to the jaws a a and to the frame 7t", a bolt h projecting through a slotj of one of the sides of the frame 70 and a treadle g carrying on one of its ends the bolt h and being journaled to one of the sides of the frame 71; substantially as described.

3. In a casing-clamp in combination: two clamping-jaws a a, a supporting-frame 7c, supporting-arms d (Z hinged to the jaws (L a and to the frame It, a treadle g carrying a bolt h projecting through one of the sides of the frame 7t and a spring 2' fixed with one end to the frame it and with its other end to the treadle g substantially as described.

In witness whereof we have hereunto set our hands in presence of two witnesses.

WILLIAM llllNltY lllAoGAltVIlY.

GEORGE TANNER. IVitnesses:

ALVESTO S. I-IoeUE, J OHANN LUST. 

